#include <iostream>
#include <semaphore>
#include <thread>
#include <chrono>

using namespace std::chrono_literals;


void worker(int id, std::binary_semaphore* wait, std::binary_semaphore* sign) {
    for (int i = 0; i < 5; i++) {
	std::cout << std::format("worker {}: working {}\n", id, i);
        std::chrono::milliseconds timesleep(1s);
        std::this_thread::sleep_for(timesleep);
	if (sign->try_acquire()) {
    	    std::cout << std::format("worker {}: break\n", id);
	    break;
	}
    }
    wait->release();
}

int main() {
    std::binary_semaphore wait(0);
    std::binary_semaphore sign(0);

    std::thread t1(worker, 1, &wait, &sign);
    t1.detach();

    std::chrono::milliseconds timesleep(1s);
    std::this_thread::sleep_for(timesleep);
    sign.release();
    std::cout << "main: wait worker\n";
    wait.acquire();
    std::cout << "main: worker finished\n";

    std::this_thread::sleep_for(timesleep);

    std::cout << "main: exit\n";
}